Pure-electricity and tow-electricity switching system for engineering vehicle and control method of pure-electricity and tow-electricity switching system

Abstract

The invention discloses a pure electric and towed electric switching system for an engineering vehicle, which comprises the engineering vehicle, a coiling device and a power supply, the engineering vehicle is an electric engineering vehicle, the engineering vehicle is provided with a power battery and a power supply input port, the power supply input port is connected with the power battery, and the power supply input port is used for charging the power battery or supplying power to the engineering vehicle; the power battery provides electric energy for the engineering vehicle in a pure electric mode, and in the pure electric mode, when the power battery supplements electric energy, the power input port is connected with a power source to supplement energy for the power battery; the coiling device is arranged on the engineering vehicle, one end of the coiling device is connected with a power supply, the other end is connected with the power supply input port to provide electric energy for the engineering vehicle, and the coiling device is connected with the power supply to drive the engineering vehicle to work in a towing mode; the wire winding device and the power battery are connected with the VCU of the engineering vehicle, switching between a pure electric mode and a towing mode is controlled through the VCU of the engineering vehicle, the vehicle can be used in a pure electric mode and a towing mode at the same time, the endurance time is prolonged, and the efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of electric construction machinery, and particularly to a pure electric - towed power switching system for engineering vehicles and its control method. Background Art

[0002] At present, pure - electric engineering vehicles have encountered numerous problems in practical applications; such vehicles are generally equipped with high - power loading equipment, resulting in extremely high energy consumption and severely limited endurance time. Usually, their endurance time is only about 4 - 5 hours.

[0003] Regarding charging, the time required for a pure - electric engineering vehicle to fully charge is extremely long; when the state of charge (SOC) of the vehicle drops to a certain level, charging has to be carried out; during the long charging process, the vehicle cannot be put into work at all and can only be in an idle waiting state. Moreover, the vehicle must be parked near the charging pile to charge, which greatly reduces its operational flexibility.

[0004] Generally speaking, the long charging time, the inability to work during charging, and the dependence on the location of the charging pile greatly reduce the utilization efficiency of pure - electric engineering vehicles, bring a lot of inconvenience to users, and also limit their large - scale popularization and application to a certain extent. Summary of the Invention

[0005] Aiming at the problems existing in the above - mentioned prior art, the present invention provides a pure electric - towed power switching system for engineering vehicles and its control method, enabling the vehicle to have both pure - electric use and towed - power use, increasing the endurance time, and solving the above problems.

[0006] To achieve the above object, the technical solution adopted by the present invention is: a pure electric - towed power switching system for engineering vehicles, including: an engineering vehicle, a cable - winding device, and a power source. The engineering vehicle is an electric engineering vehicle, and a power battery and a power input port are provided on the engineering vehicle. The power input port is connected to the power battery and is used to charge the power battery or supply power to the engineering vehicle. When the power battery provides electrical energy for the engineering vehicle, it is in the pure - electric mode. In the pure - electric mode, when the power battery is replenishing electrical energy, it is connected to the power source through the power input port to replenish energy for the power battery. The cable - winding device is arranged on the engineering vehicle, with one end connected to the power source and the other end connected to the power input port, providing electrical energy for the engineering vehicle. When the engineering vehicle is driven to work by connecting to the power source through the cable - winding device, it is in the towed - power mode. The cable - winding device, the power battery are connected to the vehicle VCU of the engineering vehicle, and the switching between the pure - electric mode and the towed - power mode is controlled through the vehicle VCU of the engineering vehicle.

[0007] Furthermore, a BMS is provided in the power battery, and both the power input port and the vehicle VCU of the engineering vehicle are connected to the BMS.

[0008] Furthermore, an operation instrument is provided in the construction vehicle and is connected to the VCU of the construction vehicle for controlling and displaying the operation of the construction vehicle.

[0009] Furthermore, the wire winding device is a quick-change wire winding device that can be quickly installed and disassembled.

[0010] Furthermore, the quick-change wire winding device includes: a base, an electric quick-release device, a base connector, and a wire winder. The base is installed on the construction vehicle, the wire winder is installed on the base, and the base and the wire winder are fixed by the electric quick-release device. The base connector is connected to the VCU of the construction vehicle, the electric quick-release device is connected to the base connector, and the electric quick-release device is controlled by the VCU of the construction vehicle to lock / unlock. The base connector is also connected to the power input port, and the connectors in the wire winder and the base connector are connected, and the other end is connected to the power supply.

[0011] Furthermore, the electric quick-release device includes: a locking motor and a positioning post. The positioning post is installed on the base for positioning the wire winder. The locking motor is installed on the base and cooperates with the positioning post to fix the wire winder. The locking motor is connected to the VCU of the construction vehicle, and the VCU of the construction vehicle controls the locking motor to work to lock / unlock the wire winder.

[0012] Furthermore, a locking tongue is provided on the output shaft of the locking motor.

[0013] A control method for a pure electric tow-electricity switching system for a construction vehicle: The connector in the wire winder is connected to the base connector, and the other end is connected to the power supply. The contactor from the power input port to the power system circuit is closed, and the construction vehicle enters the tow-electricity mode, that is, it is used for tow-electricity, and the power supply supplies power to the construction vehicle. The operation instrument selects whether to charge the power battery, and the vehicle can charge while working; when the power battery is fully charged, the charging of the power battery is disconnected, and the power supply will no longer charge the power battery and directly supply power to the construction vehicle.

[0014] Furthermore, when the construction vehicle is fully charged or the power is sufficient to support working away from the charging pile, the operation instrument selects the pure electric mode, disconnects the contactor from the power input port to the power system circuit, disconnects the connection between the wire winder and the power supply, and stores the tow-electricity cable in the wire winder, and uses the power battery to provide power for the vehicle.

[0015] Furthermore, according to the surrounding environment and space of the work, select whether to remove the wire winder. Disassembly of the wire winder: Select unlock on the operation instrument, send the instruction to the base connector through the VCU, the locking motor rotates to unlock, take out the wire winder, and remove the wire winding device to directly charge the power battery by the power supply; Installation of the reel: Install the reel on the base through the positioning posts. Select "Lock" on the operation instrument, and send the instruction to the base connector through the VCU. The locking motor rotates to lock the reel selector. It is also possible to select the pure electric mode of operation without removing the reel.

[0016] The beneficial effects of the present invention are as follows: (1) It can increase the endurance time of pure electric engineering vehicles, charge while in use, and improve efficiency; (2) It can be used as a towed electric vehicle in a fixed location, or as a pure electric vehicle in various environments. Description of the Drawings

[0017] Figure 1 It is a schematic block diagram of the system structure of the present invention; Figure 2 It is a schematic structural diagram of the quick-change reel device; Figure 3 It is a flow chart for pure electric / towed electric switching; In the figure: 1. Engineering vehicle; 11. Operation instrument; 12. VCU; 13. Power battery; 14. Power input port; 2. Quick-change reel device; 21. Base; 211. Locking motor; 212. Base connector; 213. Positioning post; 22. Reel. Detailed Embodiments

[0018] To make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. However, it should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0020] As Figure 1 shown, a pure electric / towed electric switching system for an engineering vehicle includes: an engineering vehicle 1, a reel device, and a power source. The engineering vehicle 1 is an electric engineering vehicle 1. A power battery 13 and a power input port 14 are provided on the engineering vehicle 1. The power input port 14 is connected to the power battery 13, and the power input port 14 is used to charge the power battery 13 or supply power to the engineering vehicle 1; The power battery 13 provides electrical energy for the engineering vehicle 1, which is the pure electric mode. In the pure electric mode, when the power battery 13 is replenishing electrical energy, it is connected to the power source through the power input port 14 to replenish energy for the power battery 13; The cable winding device is arranged on the engineering vehicle 1, with one end connected to the power supply and the other end connected to the power input port 14 to supply electrical energy to the engineering vehicle 1. The engineering vehicle 1 is driven to work through the connection between the cable winding device and the power supply, which is the towed power mode. The cable winding device, the power battery 13 and the engineering vehicle 1 VCU12 are connected, and the switching between the pure electric mode and the towed power mode is controlled through the engineering vehicle 1 VCU12.

[0021] The power supply is used to supply power to the engineering vehicle 11 or charge the power battery 1313.

[0022] The power battery 13 is equipped with a BMS, and both the power input port 14 and the engineering vehicle 1 VCU12 are connected to the BMS.

[0023] The engineering vehicle 1 is also equipped with an operation instrument 11, which is connected to the VCU12 of the engineering vehicle 1 and is used to control and display the operation of the engineering vehicle 1.

[0024] The cable winding device is a quick-change cable winding device 2, which can be quickly installed and disassembled.

[0025] The operation instrument 11 is an operation display device, such as a touch screen; the VCU12 is a vehicle controller.

[0026] Such as Figure 2 As shown, the quick-change cable winding device 2 includes: a bottom bracket 21, an electric quick-release device, a bottom bracket connector 212, and a cable winder 22. The cable winding device is used to store cables. The bottom bracket 21 is installed on the engineering vehicle 1, the cable winder 22 is installed on the bottom bracket 21, and the bottom bracket 21 and the cable winder 22 are fixed through the electric quick-release device. The bottom bracket connector 212 is connected to the engineering vehicle 1 VCU12, and the electric quick-release device is connected to the bottom bracket connector 212. The electric quick-release device is locked / unlocked through the engineering vehicle 1 VCU12. The bottom bracket connector 212 is also connected to the power input port 14. The connector in the cable winder 22 is connected to the bottom bracket connector 212, and the other end is connected to the power supply.

[0027] The electric quick-release device includes: a locking motor 211 and a positioning post 213. The positioning post 213 is installed on the bottom bracket 21 and is used for positioning the cable winder 22. The locking motor 211 is installed on the bottom bracket 21 and cooperates with the positioning post 213 to fix the cable winder 22. The locking motor 211 is connected to the engineering vehicle 1 VCU12, and the engineering vehicle 1 VCU12 controls the locking motor to work to lock / unlock the cable winder 22.

[0028] A locking tongue is provided on the output shaft of the locking motor 211, and the cable winder 22 is fixed through the locking tongue. The cable winder 22 is provided with a fixing structure that cooperates with the locking tongue, such as: a fixing piece, a fixing edge, a protrusion, a small hole. The cable winder 22 is also provided with a positioning seat or a positioning hole that cooperates with the positioning post 213.

[0029] As Figure 3 shown, a control method for a pure electric / towed power switching system for construction vehicles: The connector in the cable reel 22 is connected to the base connector 212, and the other end is connected to the power supply. The contactor from the power input port 14 to the power system circuit is closed, and the construction vehicle 1 enters the towed power mode, that is, it is used as towed power, and the power supply supplies power to the construction vehicle 1. The operator panel 11 is operated to select whether to charge the power battery 13, and the vehicle can charge while working; when the state of charge SOC reaches 100%, the power battery 13 is fully charged, the charging contactor is disconnected through CAN communication, the charging of the power battery 13 is disconnected, and the power supply will no longer charge the power battery 13 and directly supply power to the construction vehicle 1; When the construction vehicle 1 is fully charged or the power is sufficient to support working away from the charging pile, the operator panel 11 is operated to select the pure electric mode, the contactor from the power input port 14 to the power system circuit is disconnected, the connection between the cable reel 22 and the power supply is disconnected, and the towed cable is stored in the cable reel 22, and the power battery 13 is used to provide power for the vehicle; According to the environment and space around the work, select whether to remove the cable reel or not. Disassembly of the cable reel 22: Select unlocking on the operator panel 11, send the instruction to the base connector 212 through the VCU 12, the locking motor rotates to unlock, take out the cable reel, and remove the cable winding device to directly charge the power battery 13 by the power supply; Installation of the cable reel 22: Install the cable reel 22 on the base 21 through the positioning post 213, select locking on the operator panel 11, send the instruction to the base connector 212 through the VCU 12, and the locking motor rotates to lock the cable reel; It is also possible to select the pure electric mode to work without removing the cable reel 22.

[0030] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements or improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pure electric towing switching system for engineering vehicles, characterized in that: include: An engineering vehicle, a wire winding device, and a power source. The engineering vehicle is an electric engineering vehicle. The engineering vehicle is provided with a power battery and a power input port. The power input port is connected to the power battery, and the power input port is used to charge the power battery or supply power to the engineering vehicle. The power battery provides electric energy to the engineering vehicle, which is the pure electric mode. In the pure electric mode, when the power battery is replenished with electric energy, it is connected to the power supply through the power input port to replenish energy for the power battery; The winding device is arranged on the engineering vehicle, one end of which is connected to the power supply, and the other end is connected to the power input port, so as to provide electric energy for the engineering vehicle, and the engineering vehicle is driven to work in the towing mode by connecting the winding device to the power supply; The winding device and the power battery are connected to the VCU of the engineering vehicle, and the switching between the pure electric mode and the towing electric mode is controlled by the VCU of the engineering vehicle.

2. A pure electric towing switching system for engineering vehicles according to claim 1, characterized in that: The power battery is provided with a BMS, and the power input port and the engineering vehicle VCU are both connected to the BMS.

3. A pure electric towing switching system for engineering vehicles according to claim 2, characterized in that: The engineering vehicle is also provided with an operating instrument, which is connected to the VCU of the engineering vehicle and is used to control and display the operation of the engineering vehicle.

4. A pure electric towing switching system for engineering vehicles according to claim 3, characterized in that: The winding device is a quick-change winding device, which can be quickly installed and removed.

5. A pure electric towing switching system for engineering vehicles according to claim 4, characterized in that: The quick-change cable reel device includes: a base support, an electric quick-release device, a base support connector, and a cable reel. The base support is installed on the engineering vehicle, and the cable reel is installed on the base support. The base support and the cable reel are fixed by the electric quick-release device. The base support connector is connected to the engineering vehicle VCU, and the electric quick-release device is connected to the base support connector. The electric quick-release device is locked / unlocked by controlling the engineering vehicle VCU. The base support connector is also connected to the power input port, the connector in the cable reel and the base support connector, and the other end is connected to the power supply.

6. A pure electric towing switching system for engineering vehicles according to claim 5, characterized in that: The electric quick-release device includes: a locking motor and a positioning column. The positioning column is installed on the base and is used to position the cable reel. The locking motor is installed on the base and cooperates with the positioning column to fix the cable reel. The locking motor is connected to the VCU of the engineering vehicle. The VCU of the engineering vehicle controls the locking motor to lock / unlock the cable reel.

7. A pure electric towing switching system for engineering vehicles according to claim 6, characterized in that: The output shaft of the locking motor is provided with a locking tongue.

8. The control method of the pure electric towing switching system for an engineering vehicle according to claim 6, characterized in that: The connector in the cable reel is connected to the base connector, and the other end is connected to the power supply. The contactor connecting the power input port to the power system circuit is closed, and the engineering vehicle enters the towing mode, that is, it is used as a towing mode. The power supply supplies power to the engineering vehicle. The instrument is operated to select whether to charge the power battery. The vehicle can charge while working; when the power battery is full, the charging of the power battery is disconnected, and the power supply will no longer charge the power battery, and power will be directly supplied to the engineering vehicle.

9. A control method for a pure electric towing switching system for an engineering vehicle according to claim 8, characterized in that: When the engineering vehicle is fully charged or has enough power to support working away from the charging station, operate the instrument to select the pure electric mode, disconnect the contactor from the power input port to the power system circuit, disconnect the cable reel from the power supply, store the towing cable in the cable reel, and use the power battery to power the vehicle.

10. The control method of the pure electric towing switching system for an engineering vehicle according to claim 8, characterized in that: Choose to remove or not remove the reel selector according to the surrounding environment and space. Disassembly of the cable reel: select unlock on the operating instrument, send the command to the bottom bracket connector through the VCU, lock the motor to rotate and unlock, take out the cable selector, remove the cable reel and charge the power battery directly from the power supply; Installation of the cable reel: Install the cable reel on the base bracket through the positioning column, select lock on the operating instrument, send the command to the base bracket connector through the VCU, and lock the motor to rotate and lock the reel selector; You can also choose to work in pure electric mode without removing the reel.

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